package com.itheima.reggie.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.itheima.reggie.common.CustomException;
import com.itheima.reggie.entity.Category;
import com.itheima.reggie.entity.Dish;
import com.itheima.reggie.entity.Setmeal;
import com.itheima.reggie.mapper.CategoryMapper;
import com.itheima.reggie.service.CategoryService;
import com.itheima.reggie.service.DishService;
import com.itheima.reggie.service.SetmealService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

/**
 * @author jay
 */
@Service
public class CategoryServiceImpl extends ServiceImpl<CategoryMapper, Category> implements CategoryService {
    @Autowired
    private DishService dishService;
    @Autowired
    private SetmealService setmealService;

    /**
     * 按id删除，先判断是否关联了菜品或套餐
     * @param id
     */
    @Override
    public void remove(Long id) {
        //查看当前分类是否关联了菜品
        LambdaQueryWrapper<Dish> dishLambdaQueryWrapper = new LambdaQueryWrapper<>();
        //增加条件,看id是否有关联
        dishLambdaQueryWrapper.eq(Dish::getCategoryId,id);
        //调用mapper查询
        int count1 = dishService.count(dishLambdaQueryWrapper);
        //判断
        if(count1 > 0){
            //已经关联菜品，抛出业务异常
            throw new CustomException("当前分类下关联了菜品，不能删除");
        }

        //查看当前分类是否关联了套餐
        LambdaQueryWrapper<Setmeal> setmealLambdaQueryWrapper = new LambdaQueryWrapper<>();
        //增加条件,看id是否有关联
        setmealLambdaQueryWrapper.eq(Setmeal::getCategoryId,id);
        //调用mapper查询
        int count2 = setmealService.count(setmealLambdaQueryWrapper);
        //判断
        if(count2 > 0){
            //已经关联套餐，抛出业务异常
            throw new CustomException("当前分类下关联了套餐，不能删除");
        }

        //删除
        this.removeById(id);
    }
}
